21606210460 has 24 divisors (see below), whose sum is σ = 46937630880. Its totient is φ = 8344467264.

The previous prime is 21606210443. The next prime is 21606210467. The reversal of 21606210460 is 6401260612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21606210467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18625464 + ... + 18626623.

It is an arithmetic number, because the mean of its divisors is an integer number (1955734620).

Almost surely, 2^21606210460 is an apocalyptic number.

21606210460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21606210460 is an abundant number, since it is smaller than the sum of its proper divisors (25331420420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21606210460 is a wasteful number, since it uses less digits than its factorization.

21606210460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37252125 (or 37252123 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 21606210460 in words is "twenty-one billion, six hundred six million, two hundred ten thousand, four hundred sixty".